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Welcome to the Academic and Educational pages of the
Department of Radiology
Seth G.S. Medical College and K.E.M. Hospital, Mumbai , India
Case of the Day
Case of the Day
A 10-year-old girl was brought by her parents with a swelling on the low back since birth. There were complaints of constant dribbling of urine and loss of control of defecation
A 10-year-old girl was brought by her parents with a swelling on the low back since birth. There were complaints of constant dribbling of urine and loss of control of defecation
MRI of the brain and spine shows herniation of the cerebellar tonsils through the foramen magnum. The tonsils are 7.4 mm below the McRae’s line. There is dilatation of both lateral ventricles. There is a T2 hyperintense signal along the entire length of the spinal cord with dilatation of the central canal. At L5 level, there is herniation of the thecal sac containing neural elements extending to the the skin surface.
MRI of the brain and spine shows herniation of the cerebellar tonsils through the foramen magnum. The tonsils are 7.4 mm below the McRae’s line. There is dilatation of both lateral ventricles. There is a T2 hyperintense signal along the entire length of the spinal cord with dilatation of the central canal. At L5 level, there is herniation of the thecal sac containing neural elements extending to the the skin surface.
Hans Chiari (1851-1916) was an Austrian pathologist who, in the 1890s, first described a series of abnormalities of the hindbrain. Julius Arnold (1835-1915) was a German pathologist who also studied these hindbrain malformations. In 1895, Chiari credited Arnold for a previous publication of a case believed to be a Chiari type II malformation., While Chiari systematically classified the first four types of these malformations, the term Arnold-Chiari malformation historically became associated specifically with Chiari type II . William McRae, in 1953, described the line's use in assessing basilar invagination.
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